A reactor is also called an inductor. When a conductor is energized, it will generate a magnetic field in a certain space that it occupies. Therefore, all electrical conductors that can carry current are inductive in a general sense. Reactance is divided into inductive reactance and capacitive reactance. The more scientific classification is that inductors (inductors) and capacitive reactors (capacitors) are collectively referred to as reactors. However, since inductors existed in the past, they were called reactors. So, a called capacitor is a capacitive reactor, and a reactor specifically refers to an inductor.

Classified according to structure and cooling medium, according to connection method, according to function, and according to purpose.

1. According to the structure and cooling medium: it is divided into hollow type, iron core type, dry type, oil-immersed type, etc.
2. According to the connection method: Divided into parallel reactor and series reactor.
3. According to function: divided into current limiting and compensation.
4. According to purpose: subdivided according to specific purpose, such as: current limiting reactor, filter reactor, smoothing reactor, power factor compensation reactor, series reactor, balance reactor, grounding reactor, arc suppression coil, inlet Line reactors, outgoing reactors, saturated reactors, self-saturated reactors, variable reactors (adjustable reactors, controllable reactors), yoke reactors, series resonance reactors, parallel resonance reactors, etc.